Hadr02/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file hadronic/Hadr02/src/PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028 //
0029 //
0030 /////////////////////////////////////////////////////////////////////////
0031 //
0032 // EventActionMessenger
0033 //
0034 // Created: 31.01.03 V.Ivanchenko
0035 //
0036 // Modified:
0037 // 04.06.2006 Adoptation of hadr01 (V.Ivanchenko)
0038 // 16.11.2006 Add option allowing to have user defined beam position (VI)
0039 //
0040 ////////////////////////////////////////////////////////////////////////
0041 //
0042
0043 #include "PrimaryGeneratorAction.hh"
0044
0045 #include "HistoManager.hh"
0046
0047 #include "G4Event.hh"
0048 #include "G4ParticleGun.hh"
0049 #include "G4SystemOfUnits.hh"
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 PrimaryGeneratorAction::PrimaryGeneratorAction()
0054   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fHisto(0)
0055 {
0056   fParticleGun = new G4ParticleGun(1);
0057   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0058   fHisto = HistoManager::GetPointer();
0059 }
0060
0061 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0062
0063 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0064 {
0065   delete fParticleGun;
0066 }
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0069
0070 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
0071 {
0072   if (event->GetEventID() == 0) {
0073     if (fHisto->DefaultBeamPosition()) {
0074       G4double zVertex = -(5.0 * mm + fHisto->Length());
0075       fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., zVertex));
0076     }
0077   }
0078   fParticleGun->GeneratePrimaryVertex(event);
0079 }
0080
0081 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......